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md7a gearbox trouble

trevorjane

New member
Bit of an old chestnut this one.* We've got a md7a with an ms gearbox, first of all was there more than one type of ms gearbox fitted? because the numbers on the plate at on the top of the box suggest there may be.*
Our problem is with the reverse gear when cold it works after running the engine for 5 mins or more the shift fork moves into it's correct position (we've just replaced the cable and it is adjusted correctly) but the prop only moves very slowly, in fact it may only be moving because of the vibration the engine causes.* We,ve tried putting 60 grade oil in but it seems to make no differance.* Also when we changed the oil it was black where as when I checked the oil in the other gearbox (yes we have two of the damn things!) it was clear even after a seasons use. It is so frustrating because it seems so close to working, mabe it is just some small adjustment needs to be made by taking the fork shift out or maybe putting an even thicker oil in (if there is one)
 
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